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Unformatted text preview:  .__.,_.. ..... {ml”Hoe 8636?
SW .4 } ..éf/‘N... .. .. Sets/Statistics Unit
Mean, Median Mode, Midrange Handout— Use with 12. 2 1. Fourtest scores: 82, 78, 56, 70 2. 21,18: 30 12/ {‘53} [3,192é127’30
3. 78, 60, 64 72, 60 “
“
—
n—
“— Answers: Mean Median Mode Midrange 23.43 23.5 24 23.5
12.63 12.5 14 12.5 I7 1. 71.5 74 none 69 1/
2. 20.17 19.5 none 21 V
3. 66.6 64 6o 69 4. 6.125 7 2,6 6 5. 11.7 12 12 16 6. 7.93 10 12 6 7. 5.15 5.5 6 5 6. 7.16 6 6 7 9. o. ——I s 1%“ €53Wf (9f '69 Sets/Statistics upt/ ,'
Percentile Ha ,dout — Use after 12.2 The n' rank of a value in a distribution tells the percent of scores that were 638 th he given value. in the table below 75% of scores were lgss than
the score 650. The following are typical questions asked on the CLAS . The information below refers to scores on a standardized exam. 1. What percent of testtakers had scores th
were less than 600? 55 z 2. Wha crash of testtakers had scores th twee“W 535‘
w egfﬂanmequaltoggz 25% / 55 ”3,3
, m 2 6' ‘WMA 3. Approximately what percent of testtakersrA H .__,_ _____,_ 5'5
had scores that were between 700 end 7”” / 0
350? ‘ (GE/20.] 5591 6 The following table gives an accurate portrayal of the distribution of humans
according to IQ. , 4. What percent of humans have 105 greater
than or equal to 115? 5. What percent of humans have 105 less
than 115? 6. Approximately what percent of humans
have [05 between 119 and 87? 7. What percent of students had scores greater
than or equal to 80? 8. What percent had scores less than 90? 9. Approximately whet percent of students had
scores between 90 and 65? 10. The table below shows the percentile distribution of studean according to their scores
on a math exam. Test Score Percenrr'le Rank What percentage of students scored less than 55? A. 55% B. 35% C. 20% D. 80% ercentile continued .Tbe table below shows the percentile distribution according to length 0!: spotted sea 12‘ Thetable 5619'” give: the percentile distribution according to value of tinglefamily
H; mm hweaed by recreational anglers in 1 Florida Gulf Coast ﬁshery.  “mm m I m committ I Len  of ﬁsh (inches) What percentage of these ﬁsh are 25 inches long or longer?
What percentage of homes have values between 550.000 and 3100.000? A. 5% B. 99%
A. 35%
C. H: D. 95%
B. 60%
C. 70%
D. 25% 14 'ﬂte table below shows the projected percentile distribution according to age of the
us. population in the year 20l0 (source: Bureau of the Census. v.5. Deparment of
Commerce). 13. The table below shows the percentile distribution according to average monthly utility
bill of the residentiei custom of a municipal utility company. AvmeMonthl BilliS)
“— Percentile Rank What percentage of customers have average monthly utility bills of $250 or more? A. 15% B. 95% According to these projections. what percentage of the US. population will be younger
than 25 years of age in the year 2010? C' ”0% A. 24% B. 31% D“ 25% c. 35% D. 66% '15 The table below shows the percentile distribution according to age of licensed drivers
in the US. (mutter U.S. Department of Transportation). What percentage of drivers are between 20 and 45 years of age? A. 55% B. 51%
D. 37% Answers: 1.55% 2. 25% 3.55% 4. 18% 5. 84% 6. 70% 7.37%
8.86% 9.61% 10. B 11.A 12.A 13.D 14.0 15.A Used with permission from CLAST Manual  Wooiand, Prentice Hall C? Mean, Median, Mode Comparison from Graphs ‘
Skewed to the Right: * “,JMM‘“ 1 (1635
$.qu a“!
@de < Median < M939) 76% (J WW5?"— Skewed to the Left: Q Mean < Median < Mode 5 ,a,»
17”,
Hm WM Wﬂu Normal Symmetric: ...
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 Spring '11
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